Traditional SBC engines were 9.025" block deck height.
I think the confusion may have come from some LS engines being adjacent in the list, they are 9.24" as shown.
Most big blocks are 9.80" as shown, including the 502. There are tall deck big block (10.20"). There were truck engines, 366" and 427", that were tall deck. The 572" GMPP engines are tall deck.
Back to the original question about how far forward you mount the engine, you basically have 3 basic choices.
If you place the BBC with the back of the engine in the original location, you'll have serious firewall mods to do. But more room for the oil pan and front of the engine.
If you move the engine 3/4" forward, you'll have minor firewall mods, you'll have to be picky about the oil pan (Milodon has one that fits), and you'll still have a bit of room for the accessory drive. This is probably the most common setup used.
If you move the engine 2-1/4" forward, then your firewall will clear nicely, you'll have to have a modified oil pan or a dropped center link, and you'll be crowded in the accessory drive/radiator area.
markm's comments about the tunnel ram and blower are also worth considering. Also the blower drive might be a problem at the front.
It's all a balancing act. Kind of like stepping on a balloon. Each choice lead to more choices. There is no "right" way.
I have three of the cutout BBC pans, might part with one of interested.
IMO 2.25" forward is unnecessary to clear the heads and valve covers (unless they're really tall valve covers) and it reduces the space everywhere else by an additional 3/4" that's not needed. But it may be necessary for the blower to clear....I don't know. As I said, 1.5" will eliminate problems with the heads and valve covers using a stock firewall. Some guys have claimed to put a BBC in the stock location without modifyng the firewall, but I don't believe it.
For reference, here's some pics of my 502 in my Nomad at 1.5" forward. The engine also sits a bit higher than stock and is at a 5.5 degree angle to clear the C4 steering rack so it's not a perfect comparison. At the stock height and angle there will be more clearance. The firewall was previously "massaged" to fit a BBC 1/2" forward. You can see the dents in the driver's side corner, near the master cylinder holes, and the passenger side setback was enlarged upward to clear the valve covers of a 427 I previously had in it at 1/2" forward.
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Here's the driver's side looking straight across the firewall with the engine 1.5" forward. The passenger side is further back.
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56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension
Other vehicles:
56 Chevy 2-door BelAir sedan
56 Chevy 210 4-door sedan
57 Chevy 210 4-door sedan
1962 327/340HP Corvette
1961 Willys CJ3B Jeep
2001 Porsche Boxster S
2003 Chevy Silverado 2500 HD Duramax
2019 GMC Sierra Denali Duramax
I still say the best way to deal with the issue of engine placement, especially with tall valve covers and a blower, is to put it together and drop it in. Then determine how far forward you want to go. I'd even install the headers and accessories to make sure they clear everything.
56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension
Other vehicles:
56 Chevy 2-door BelAir sedan
56 Chevy 210 4-door sedan
57 Chevy 210 4-door sedan
1962 327/340HP Corvette
1961 Willys CJ3B Jeep
2001 Porsche Boxster S
2003 Chevy Silverado 2500 HD Duramax
2019 GMC Sierra Denali Duramax