as for timing... suntuned HATES the adjustable vac adv canisters, stick with a stock one of known advance. i suggest contacting him or cliff for advice on that.
also the vac advance should almost always be connected to a ported vac source, not manifold. that is most likely whats causing the surging, cliff almost always says use ported vac from the carb, above the base plate, you should have a couple unused ports for that.
also agree to try & get the engine running cooler, 200+ is not too hot to cause damage but definitely doesnt need to be that high, not sure what t-stat you have or what the rest of teh cooling system is, but a 180 t-stat is best in most street cars & if you can lower the temps 15-20* it should help the pressure.
i think 20/50 is too thick for a street engine, 10/30 may be on the thin side... why not try a good 10/40 conventional oil or maybe a 15/40 diesel oil like delo 400 or rotella-t? might increase the pressure a bit, & with reduced temps you should be fine.
change the timing to ported & swap back out to a factory vac advance, then set timing based on the dist curve & known base & vac adv numbers. contact suntuned, he can provide a good vac adv canister based on your engines specs. if the dist wasnt re-curved, that will be a big help.
good luck
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