Mine is a GMC, but its a canadian model so I am not sure if it has more room then the chevys since the GMC's had Chevy engines up here. Not many 270's or 302's around here as far as I know since, again, GMC's had chevy engines. I guess that speed Is a greater priority then power at first. I forgot to mention that I also have a 60 GMC SWB with a good 235, 4 speed, and open rearend (3.90 I think). Would it be worthwhile to put this tranny and rear end in my 53? Would I get more speed? or would it be a pain since I think it has the hydraulic clutch? or should I find another 3 speed with an open yoke? (I'm just throwing out ideas because I need to do something) Thanks for all the input! I'm very grateful.