I currently have a 1989 305 TPI engine in my 57 Chev using side engine mounts (Ecklers part 18-02). I also am using an Ecklers rack and pinion kit (Ecklers part number 57-1408221).

I’m considering pulling out the 305 TPI and installing an LS engine (ideally I want an LS7, but may end up with what ever I can make work with my budget). I’m curious which of the following LS engines will install into the stock frame and have no clearance issues with the rack and pinion I’m currently using.

So the engines I’m now considering are:
-LS1
-LS6
-LS2
-LS3

Any insight and info is appreciated.