The best stroker 408-416-426-435 combination in stock 68 340 block

No offense but the 340 should have been faster... So with the understanding that something was amiss there - "your results may vary"...
I've never signed on to Hughes' marketing BS, no would I use their flow numbers to pick a camshaft. Based on your comments I'd say their product has not helped you attain what you wanted or you'd not be doing what you're doing. So when the heads come in, have them tested by a 3rd party in order to get an idea of the cam you need. I would ditch the hydraulic roller cam. It's heavy and slow compared to a decent flat tappet solid. If you want roller, go all the way. Bush the lifter bores, and get a solid street-type roller. I'd stick in a decent forged stroker kit. As long as you stick with forged cranks the various suppliers are about the same cost and quality in small blocks. As for the rest: match the parts well; machine the block well (I am assuming this is a new engine & being fully machined by a performance shop - not the parts stuck in a block that was machined and ran as the 340). Then match the driveline well and fix the suspension issues you have/will have. Do those and it will do what you want and last just fine.