small block moline motors 206 or220

want to build small block for tractor pulling would really appreciate any recommendations size of overbore max stroke what would be the best NO. OF HEADS TO USE NO SMALL BLOCK PULLERS IN MY AREA TO WORK OFF OF COULD SURE USE YOUR HELP THANKS
 
I have one that is a four inch bore and a five and half inch stroke with stock rods. It takes a lot of clearance work around the cam with the stock rods and a stroked crank.
 

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