ideal head temp ranges for a type one

The Hot vw milage motor reported temps on the heads at 60 mph of 255 with 137 jets 275 with 142 jets.

Concidering the compresson for my verson and a compresson range from 8.1to 1 to 8.3to1 would yo go for the higher compresson or the lower compression what would you round it off to .

I know this is not much of a difference and its very nitpicky but Humour me.

If im going to the trouble to check the cc on the finished heads and hand sand an polish them to within 1/4 cc per clyinder what would you shoot for hotter or cooler??

I've read 375 F is on the normal range; please someone clarify this since I'm not sure. With respect to compression ratio in the 8's to 1 would be the most I'd go in a Speedster replica; engines in these cars need all the cooling help they can get as opposed to other applications.

My speedster has 2 black nylon rear fender liners that work like air rams to scoop up air and direct it to the air intake behind the engine it helps a bunch.. and is all hiden..

The only thing I know that would be better would be to duplicate the air intake slots like a beetle has across the back just between the lid and the rag top.. But then it wouldn't be as correct looking.

8.25 to 1 or slighty higher seems to be a decent range I don't want it as high as 8.5 to 1 ..

But I was hoping for more input from here. that might help comfirm some of my reseach.

If I want to go hotter I need to cut back on the chambers to a even 57cc.and just use one shim of apropriate thickness to dial it in.