Best 273 and 318 builds (NO 360's please)

stock good compression 318 short block, good condition 318 heads, (was going to cut in 1.88 intakes but its not my main motor so ill keep it cheap) stock 340 auto cam, 273 4bbl iron single plane intake, 3.91 gears, Cyclone fenderwell headers in a 2900 lb car.. Well see what she does.

273 steel crank and 340 rods?? a balance job will cost more in mallory metal than the motor...unless those pistons are very light.