71 monte engine size

How big of an engine do you think i could fit into a 71 monte?

lol u can fit a bbc with ease the ss in that yr came with 454's produceing any where from 320 to 360hp

DO you think i could fit a 502 caddy engine in it?

yes you can swap 500 cadillac motor,also 472 or 425 all are the same physically on the outside.great tourque motor.you have to buy or make motor mount adapters.big block chevy headers work,you have to buy aheader flange kit and cut the chevy flange off and weld new one on.also you need the rear sump oil pan and pickup tube from an eldorado-these are pretty rare you can however buy a new pan aftermarket pricey though,about $350.00. avery good source is MTS. www.500cid.com . they have all the parts mentioned above. also larry kruzic aka "cadillac larry" out of florida I believe. sorry don't have address if I can find it I will post it. he claims to be the first to hot rod the caddy motor. he also has the parts mentioned. he is kind of independent and closed mouthed if you don't spend money with him and doesn't seem to like the other people much that are selling caddy parts .he does have a catalog with a bunch of tips and useful info. hope this helps . P.S. the oil pump is the weak link upgrade to modified pump is highly recommended. both offer these.

how big do you want?