Your 60 foot times will likely slow to about 1.38-1.40 range, depending on rear gear choice. Worse if you miss on converter selection. There are many pro/cons to either choice.
Considering you have stealth heads, instead of Edelbrocks or Indys, I'm gonna guess the budget is tight, and to do the PG swap right will easily set you back 2 grand, and that's a basic sportsman glide. On the other hand, a top of the line Griner Brake with LB apply for the 727 is 700$.

How many runs on the 727? Without a brake, we used to run basically stock 727s with transgo FM shift kits at that Hp/Weight level for 3 or 4 hundred passes between clutch replacements.