D-Ports X Oval ports / Help please

[1500SBR]

Newcomer, if this was discussed before, can you guys please point me out.

This is my engine - Type1
1914 running alcohol, 13:1 CR
heads are currently 40X35 minor P&P
W110 (284) with 1,25 rockers
Dual Weber 44 (F3 - 200mains/210air/85idles/250 needles, again alcohol).

The engine is strong, but runs out of breath at 6000 (even a bit before).

My plan is to step up to a W140 (maybe an FK something)
Bump compression to as much as I can, but no more than 14:1
Step up to 42 intake valves (keep the 35,5)
Further port the heads, unshrould and 3 angle job.

Goal:

My goal is around 170hp and 7500rpm

QUestions:

Should I go with D ports or Oval? What are the advantages and disadvantages?

Cam selection? Does that sound ok?

Any further suggestions?

Thanks,