the design is for ford integral logs....i have seen a chevy 250 log and its about the same....it wouldnt be too hard to think something up though for the GM...i dont know exactly what it looks like though...for the 4" square part do u mean the part the carb sits on or the actual log itself? i'm sure if u brought it to a shop u could easily get the intake shaved...then just do some grinding and drilling at home...
