Man I dunno I'm used to paying 40 bucks for 318s wit a 904 attached to them but alas it isnt the good old days. I say $500 max. There is this underworld who thinks 318s are 340s or something i dunno...
I miss the good old days. The barracuda in my icon I bought for $750 and it came with a 273HP complete engine and an extra mostly rebuilt 318. That about how much I paid for this engine tranny combo because I'm impatient. Most of the blocks or cores were going for 200-300 around here and then tranny cores were about the same. So 500-600 bucks and then rebuild it all, then buy all the performance parts. So I rolled the dice and figured I'm not loosing out unless I happened across a good deal. (haven't seen a good mopar deal in my area in a long time)