Engine build help

At the track on Tuesday I ended up spinning a rod bearing, I have the motor out and will be surveying the damage tonight, but I am look for some suggestions on a good lower end parts. The car will on be run on 110 fuel, and driven about 200 miles a year, 50/50 between strip and street Here are the specs of the car:

65 Dart 2,900 lbs
1967 440 block currently has steel crank with kb pistons (suggestions please)
Stock 906 heads, comp cam springs eventually will go with Eddies or Indys
Mopar .509 / .248 @.50 hydraulic cam
Hughes 2,500 stall
Ford 8.8" rearend with 3.55 but I also have a set of 3.91s I am considering

I am wondering about ideal compression ratio, based on my current set up and thinking about the 440 source stroker kit to make it a 500.