if you were to lay a VE exhaust manifold gasket on top of a SR gasket, you would see that the ports are a little different. a SR manifold/flange will work, but you will have to slighltly bore/port the flange to fit.
this is one of our stock port size DE flanges on top of a VE exh mani gasket.
Here is a turbo VE that is making some power
http://www.sr20forum.com/showthread.php?t=137466
and keep your SR16 trans or send it to me...short ratios and big tires/traction make for a whole lot of accleration

iirc, the SR16 trans is also as strong as the b15 trans.