A500 or 727 with GV?

The engine is a 30 over 360LA block with zero decked KB107 pistons. I have magnum heads with an 0.040 compressed head gasket for a measured 10.6:1 compression. The cam is a Comp XE268H (224/[email protected]", .509/.512 with the magnum 1.7 ratio rockers). Induction is a Crosswind intake and Holley Street Avenger 670 carb. 1 5/8" headers with 2.5" mandrel bent exhaust. The tranny is the mentioned A833OD with 3.55 gears and 27" tall tires.

You likely won't get quite that mileage with an auto. NOTE: I tried a lot of different carbs before settling on the 670 Street Avenger, just switching to a Holley 3310 750 and I loose 5 mpg and gain no noticeable power. Double pumper carbs won't do as well either.