The problem with the 2-bolt block is not the fact that it is 2 bolt but the way ford designed the main webbing. The blocks have the
oil hole from the camshaft to the mains right down the middle of the block. This is weak erea of the block. The weight of the rotating assembley and the rpms are the most important thing hear. The blocks try to split and do split down the number 2 and 4 mains which causes loss of
oil pressure and bearing loss. You should have no problems with what you are doing. Like I said before we have seen these blocks split at 550 to 600 HP with rpm range in the 7000 range, these have been drag engines that do nothing but turn this rpm time and time again. Use the 2 bolts block with main studs and balance everyhting good and you will have no problems. Keith