Flat tappet to solid roller...

Thank you sir! I already have tunnel ram, but need carbs for it. I was thinking to get two 600cfm double pumpers... No money for this now so no problem ;-)

I was worried that I went too far with this pushrod extension thing...
Yes the pushrod job looks very pretty, BUT, I'm sorry, I'm going to be the nay sayer here. Do not run the engine any more with the spliced pushrods. You are courting disaster there. There is a reason that pushrods have the cup end installed in as far as they do and not pushed in just 8mm or so.