Which heads?

He is plenty responsible to handle this car. I’m not trying to make a ton of power just thought with the small cam I chose that the small chamber heads might make a little less doggy engine. The 273 was rebuilt before setting up for 18 years the heads appear to be fine, the engine just has rust in the cylinders from sitting so long. If the 360 heads are the best option I will put matching springs on them and run em. He is planning a 5.7 Hemi swap in the future anyways this why we are keeping this one as cheap as possible.
That's good to hear. I wasn't that responsible at 20. I think your camshaft will alleviate the 'doggyness.'
Also you could mill the heads .040" and then the intake to match which would reduce the chamber to (maybe, possibly) about 66cc which ALSO will alleviate the 'doggyness.' My apologies for offending you. I believe that you probably have the '675' cylinder heads used both on 360's and 318's with your 360 being a late 70's block.