best 273 mods?

Then the first 2 replies are your answer.

MVR said; I bored mine .030 and put in 10 to 1's. Added a mild Isky cam, made all the difference in the world.

I'd not go above 9.5-1.

Johnny D said; Port the heads, Ede Performer intake, 4 bbl carb, Comp Cam, Headers/dual exhaust, MP Performance elec ignition kit,rear gear (323,355).

A general direction given, not a bad start. Bowl port the heads and back cut the OE valves. The carb will be 600 or less cfm's. 2-1/4 exhaust pipe. Select cam based on the cams power range and where you drive the car in.

If you cruise @ 3000 RPM, the cam should make power before hand. A 2500 -+ cam starting power point is a bit raadical for a small engine. Look at something that has a bracket power band of 1800 or 2200 start point. The 3000 cruise is right in that area with a smaller cams starting power point like I listed above.

IE; Advertised duration like
268, 270, 280 max.
The Performaer is more than enuff intake for the engine and has great drivabilty.