Good 408 combo?

bad - How deep are your pockets? The main things you want to be aware of: Using open chamber heads means to get compression you need a flat top piston. That means if you want to upgrade top end later you will need bigger chambers and that aint the way to fly. I'd rather sacrifice compression now for versatility later. So I'd run a dished piston. All piston choices should be forged. The heads will restrict, but you can use the cam to get more power from what you have. Conservative 4" stroke cams are high 230°[email protected]" lift. So you are loking for a decent sized cam. In terms of lift, the pushrod angle will lose you .020 of lift so you can account for it by running something in the .560 range. More if it's a solid flat tappet design. Make sure you head guy knows what cam you want to run... He'll need to cut the heads for dual springs. As was mentioned... Run a carb at least 850cfm dry flow rating. I typically run 870 wet flowed (about 18% more flow than a dry flow rated carb) on street 4" arm engine. Last, get it internally balanced. It will last longer and make more power for a small bit more money.