Building a 340 engine

Porting or other heads to get more head flow. That is why so many good folks here spend so much time talking about head flow.... it is the one key limit that you have to eventually get past to get to more HP. A big cam will not make the heads flow more than they can flow.

But your emphasis on peak HP does not match up exactly with what I thought you wanted to do with the engine and car; I think you said 'almost a daily driver'. (But I may be interpreting that wrong, and it may be the translation of language.)