Don't get it right, just get it running. 85 318 roller

Well, which heads are they? Js 0r 308s?
308s were original 360 roller heads, they do not require any pushrod hole clearancing at all. Js, however, were HFT heads and do need the holes clearanced.
The 318 heads you referred to, I assume are the original heads from your 318 roller motor; which would be 302s. Obviously, no mods needed there for them to work, they already have hardened seats, and a smaller combustion chamber than either the Js or the 308s that will keep your compression ratio where it belongs on a stock 318 roller.

Sorry,

I for sure have a set of J heads that were on a 340 of mine.
I have the original 302 heads.
I also have another set of heads that were on a HFT 318 motor, not sure the casting number though, I'll have to look tomorrow.