700R4 swap question

[sav300]

Ok I know that my questions have been asked alot on here and I did search before posting this, but I'm just trying to get a real estimate.

First off here are my specifics(all of them):
355SB
Edlebrock performer intake (NOT the airgap)
Edelbrock 1406 Carb
Edelbrock Performer cam
Edelbrock Adapter plate (1")
16"x4" Air cleaner
Corvette aluminum heads (58cc chambers)
KB Hypereutectic Pistons (apx. 10.9:1)
Stock rods and crank
Flowtech Afterburner headers
2.5" Exhaust with Summit turbo mufflers
33" tires
3.73 gears with open diffs
4" lift
SWB
TH350 w/NP208
TCI tranny cooler
5260Lbs on the scales

With this set up I get about 9-12MPG in town depending on my foot and traffic. On the highway I can get 13-16MPG and its normaly 15MPG at 55mph (2200rpms).


I am switching my TH350 and NP208 for a completely rebuilt 700R4 and NP208(they have no miles on them). I am buying a 2000-2600 stall lock up converter for it. I would like to hear what you think my gain in milage will be and if there are any mods I need to do to fit this setup; shorten driveline, kickdown adapter, ect. I plan to buy an electric fan for it when I do the swap to help boost the economy a little.

Any and all input is greatly appreciated.



Thomas