With the 274 I believe you need a higher stall converter in the transmission. The difference overall isin't going to be that huge. I'm between those two cams as well... if I had a manual I'd get the 274 but since I doubt the extra gain will be worth spending an extra few hundred on the stall converter, I'd go with the 268. Both should work though.
I have a Crane 288 something and stock stall.
edit: forgot to talk about your car...
By street machine do you mean you want it as fast as your 03 or faster, even? With a bigger cam like a 288 and the right heads, it's easily possible. Mine walks GTs (no offense). If you want a smooth idle with still a lot of power go with the 268.
edit: forgot to talk about your car...
By street machine do you mean you want it as fast as your 03 or faster, even? With a bigger cam like a 288 and the right heads, it's easily possible. Mine walks GTs (no offense). If you want a smooth idle with still a lot of power go with the 268.
My first inclination is to tell you to go with the milder of the two you mention.
When you say "stock" bottom end do you mean plain cast stock pistons and factory fasteners? If so a prubent RPM limit is in order and you may run into P/V clearance issues.
What is your compression ratio going to be?
When you say "stock" bottom end do you mean plain cast stock pistons and factory fasteners? If so a prubent RPM limit is in order and you may run into P/V clearance issues.
What is your compression ratio going to be?