My buddy has almost the exact same set up right now. vforce 2s, fattys, stock carbs with clamp ons, timing plate at plus 4, and he just got his cylinders bored and an aggressive trail port by Driveline in Michigan with a modified stock head to run interchangeable domes. Depending on what your budget is OP it only costed by buddy around 500 bucks to get his cylinders bored, ported, and head work with domes and pistons. Will still be making decent power with a stock stroke.