Looking at building a new motor for my ae86.
My questions are:

What is better as a base motor forte setup I'm after?
The car will have very light street work and setting it up for drif mostly.

16v bigport or 20v blacktop or silver top

16v bigport with 41mm quad carbys and big cams

16v bigport with itb's and big cams

20v with cams?

All with hicomp pistons and aftermarket ecu.

-also are 20v motor mounts in an 86 any different to that of a 16v?

And what are the weights of both motors?

Cheers