I am running a Performer on my 304. The engine has a lot of go-fast goodies on it and is .040 over, but it runs very nice. For a stock 290 engine I would put my dough in a set of 304 heads, a stock 4 barrel manifold and a better ign. I think you would get more poop for the same price. Don't go any higher than 500 CFM on that little engine....Russ ____________________________________________________ Sell on Yahoo! Auctions ? no fees. Bid on great items. http://auctions.yahoo.com/