[Dominik]

Good morning,
I found plenty of articles on the web, plus bits and pieces here, but not 100% what I am looking for.

South Africa is a place for good engineering, but bad for importing from the USA.

I like to build a stroker 390 to get to 427. I read that I need 4.125" stroke, 30 over and Chevy BB rods. I have a 390 crank.

Are the BB rods the same width as the 390 rods?

What is the pin/compression height of the piston, assuming Zero deck height?
Knowing the latter may allow me to find flat top pistons for 11:1 CR locally.

Can bigger valves fit the original cast heads? I don't have them yet, so I can't provide casting numbers.

What is a good hydraulic lifter cam, so that I can keep the stock rocker arm assy.

I am not after top hp and torque.