bigger is better right?

[wibilly]

well i think i'm gonna bail on the 400 pontiac engine for my 71 3/4 short fleet 4x4 and go with a 500 caddy now i'm not sure my turbo 350's gonna cut it since i got a locker and 33's . i have a 400 but it's a long tail shaft so i guess i need to find a 4wd output shaft and a 400 imput for my 205 or i have a 4 speed grany and matching 205 but i dont think i'll have clearance for cluch linkage any body put a 500 caddy in a 4x4 and what did you use for a tranny would there be somthing betterthan any of these options that i'm not aware of i would like overdrive but i have already gone over board but if there is somthing that would hold up and be cost efective in the long run well then what the he77 it's only money ,right?