[unstable bob gable]

For a long time the "H" configuration was considered to be the choice for max effort engines, but by the nature of their design they can be heavier than an "I" beam rod. For the power level that you are looking to achieve either style rod would be fine. There are many choices available for a recip. assy. It really comes down to how much money you want to spend. A lot of the cheaper parts are made and machined over seas. Or made overseas and machined here. If you want quality 4340 steel American made parts it is going to cost you more than the over seas/off brand stuff. So, I'd check the budget, and see what you are willing to spend.