Need Opinion on Engine Selection

[PHOENIX]

As far as 6-speed's go you might want to consider this one:
This one will put the shifter in the original location so it does not interfere with the seat or center console.
http://www.standardtransmission.com/BW_T-56.html
1386-000-011MS
Aftermarket GM
w/ shifter modified for 4sp replacement application
$2575.00

Standard Transmission & Gear Co.
1000 N.E. 29th
Fort Worth, TX 76106
Local: (817) 625-7109
Toll Free: 800-783-8726
Fax: (817) 625-0580

EDIT:
The Richmond only has one overdrive, while the T-56 above has two.
So it depends on which you would prefer. If you plan to drive at highway speeds often you may want the two overdrives, if you are more for hotrodding around town with some highway driving the Richmond 6 would suit you fine too. I believe the 4-speed shifter location is something to really consider.