Heads are as stated 'smog' heads and if I would make any changes it would be here. They are 305HO '416' heads,1.84 in.,1.5 ex.,58cc chambers,,,yeah I know,,,YUK! Not a good head for a hipo build but I can't see why they wouldn't flow enough to get a 3200 lb. vehicle in the low 15's.
They have been used on NHRA stock and SS cars with some work.