Swap question

Sorry i missed info ,it had slant 6, 3 on the tree,not sure of the rear end but I imagine it's a small one if it's a slant 6.can an 8 3/4 rear fit is it needed? i would like to run a 360-383 or 440, @least 300. horse w 4 speed and street strip rear what about trans converter ,can I do 15inch wheels what would my bolt pattern be