Ok.Thanks for all replies so far .
I have been recommened TRW speed-pro, KB 107 and KB 190.
Trw speed pro seems a litle low in compression and KB 190 a litle high, they also require machining of heads.
KB 107 seems to me to be the compromise, that can used with both the iron 340 heads and alu aftermarket heads, am I right?

The low wear of my cylinders in mind, I judge from your replies that boring the cylindes is not necessary and use of moly rings are best when doing a home honing.

What cam will the right match? (Again good street preformer, not race)
I have a offenhauser inlet + 650cmf cab and headers.