Thanks for the food fellas. Yeah, I know those x heads are old school. Never ported anything before but I'm not afraid. Saw an article in Mopar Muscle where they put a comp xtreme energy 268 cam in a 340 with stock x heads, air gap intake, 800 carb and 1 5/8 tube headers and made 392 hp. Not bad with 40 year old stock heads. A little porting and the 6 pack she should go 425 hp or so I would guess.