Measure your bores in that 273-4 intake. The primaries may be a tad too small for modern era carbs, ie edel 600, break out the grinder or run a open plenum spacer. Iirc they used to mount hemi cross ram holleys onto the 273-4 with a primary bore notch. If your dead set on using a different carb other than a dual pattern carter-brock, you can cut the whole 4 port flange out of the 360 degree intake and make it a common plenum. Add a 2" wilson spacer and youll get another 1000 rpms out of that intake. Not hard to do with a tight 273.