470 Low deck, Toss up on a low deck between the Street Dommy and the RPM with the edge going to the SD. a little plenum radiusing from the flange and porting to the SD between the 2-1 and 5-7 (consecutive firing holes) makes a pretty noticeable difference on the SD so ported I really like the SD which on a 470 also has the benefit of pretty short and unrestricted runners to the Intake valves at WOT.

470 RB motor, Automatic toss up between the Street Dommy and the Indy 440-2d. 470's like to rev and the 2D breathes deeper trhen the RPM. On a 440 RB I'd take the RPM though since a 440" motor will take a few 100 RPM more to hit the sweet spot all else being equal.

Pick the right heads and cam though and you really would be happy with any of them.

4 speed I would prefer a single plane either way so a SD again. The TM-6/TM-7 is a great manifold up top (unported it's better then the SD OOTB) but will typically be a little down on torque to an SD below 3500-4000 on a typical street range compression type motor.

I'm not down on the RPM it's about the best OOTB (can't miss) manifold out there, it's just the 470 tend to be a bit torquier and rev happier (lower bobweight) , the other drawback to the RPM is that it's TALL and usually limits you to using a drop base 3" high air cleaner on a flat hood B/E body.