The 185's are hard to beat. I'd use a flatop piston and order the heads with the 58cc chambers. 1/16x1/16x3/16 rings. Solid flat tappet cam, 235/240 @.050, .560 lift, 108-110- sep. 1 5/8 long tube headers with a nice 2 1/2 in. exhaust.
My old set-up was very similar to this and the best run was a [email protected]