You do know that adding a 4bbl to an otherwise stock 273 2bbl combo is almost a complete waste of time .... right?
You'll have far greater results with adding more rear gear. Far greater.
The biggest improvement on a 2 bbl 273 or 318 would be to add dual exhaust... The stock single exhaust is very restrictive and going to dual exhaust really wakes them up...
Then go to a 4 bbl and then possibly a cam will make the next gains in performance...
