273 upgrade to 4bbl?

To be honest in my opinion there won't be a "drastic" increase in pep. SOME of the limitations are the 2bl pistons. We went from 2bl to 4bl(never drove it with 2bl) on our 273,(comp cam, lifters, timing chain), but cam was 340 sft cam so that's my fault. Not as peppy as I'd like, your results may vary.