need some help

Wiseco will make anything you can dream up and the pistons come with pins and locks. Give them a call and tell them what you are trying to do. Then sit back and wait 3 to 4 weeks. For what it's worth, you will need a 5cc dish or flat tops with that much valve notch to get 11.5 to 1 with a 4" stroke and a 3.97" bore with 64cc chambers and 0 deck. Their number is 800-321-1364. Hope this helps.