Looking at an engine swap.

Alright im looking at an engine swap? Im planning one goin down to the junkyard and looking at the engines. WHat car should i look for woith what engins. I was thinking about b20 but how muhc mod do u have to do? or is b18 have les mods? And what is a usualy good engine junk yard price? later
neal

b18 will give you greater performance, but b20 is pretty basic and better than the stock engine. Not to mention a b18 will cost you big unless you get a good junkyard deal.