Chad, How much taller than stock are your valve covers? I have my engine mounted very similar to what yours is. About 3/4" forward and just high enough for a 6 3/4 balancer to clear the steering rack. I have plenty of clearance at the firewall with stock height covers but looks like it would get pretty tight with a 1" taller cover in the area where the battery box mounts. I have the trans (Muncie 4 speed) moved up about as high as it will go without tunnel mods.
Brian