Ron....that's my big hold up...what cam to put in...mom and the boy whan to do more driving around...the other engine was a solid 4 mpg so I was good for 50 miles round trip...couldn't go anywhere with out a support car with fuel for the GTX...I'm tired of that...!!! so with this engine I'm looking for 8 mpg or better....so when it's on the dyno I was thinking of pulling it with a small stick first and then slide something else in to see what these heads work like..(there smaller Indy 1's than the ones on the old engine) these are a 350 cc intake port and a 200 cc ex port..