That is route I am going down. After I did all the math for a 318 vs 390 build. There wasn't a lot of $$$ difference. You can just slap in new slugs but if you are going through the work. You should have about 600-700 in machining just the block. To do it right. You should have it hot tanked and bore and honed, you should have it line honed as well and you should square the deck... around here that is $600 for all that. You can tack on another $50 or so and just have them do cam bearings and freeze plugs...
