273 heads on 318

You have several choices: Eddy Performer, Eddy LD4B, Holley Street dominator.

The Holley and the LD4B are out of production, so you'll only find them used.

Many will say that the LD4B is the only one to buy; don't know never used one.

A decade ago I did a 318 with 66 273 heads in my Barracuda, used a Performer intake, I thought it worked well, went 13.92 in the 1/4 with an unsorted combination.

I am a firm believer in using what you've got and what you can afford; some differences are almost too close to measure.