415HP from 318ci IS POSSABLE!!
I just sat down and figured it up and I can only come up to $3,835.00 with me doing everything including the head work, assembly and buying all the parts, doing all the machining. This includes grinding the crank, shot peening the rod's and resizing them, new pistons and rings. Gaskets, and oil pump, chain and gears, cam and lifters, adj. rockers and pushrods to fit. Square decking the block, line boreing, boreing and honeing with TQ plates. Decking the heads and machining the intake face, multi angle valve job, bowl porting, flow benching, intake manifold, new rod bolts, new valves and springs, retainers and locks, machining the heads for seals and larger springs. A new set of head bolts, mopar thin gaskets.
Now if he does his own head work then the price will come down about $700.00. Now I can't say what the heads would be like when there done if the customer does them. But I do know that when I'm done with them the engine will make well over 425 HP at the flywheel. The engine that I would build would be similar to the 322 engine, and that engine puts almost 400 HP to the tires, not at the flywheel. If he wants one I'll do one for him for $3,835.00 with everything listed.
Figure up how much HP it takes to push a 3,330 lbs car 11.40's 1/4 on pump gas and then figure what the HP is at the flywheel. The least that it can take is 375 HP to the tires, so I guess that makes the engine well over 400 HP at the flywheel. Through drivetarin and frictional losses, and pumping losses.
So as far as I'm concerned I don't have to prove anything as I've been doing this for years. I'm sorry that you can't. Maybe you should move south where prices are a good bit cheaper. A complete blueprinting of a virgin block is only about a $1,000.00 or so CNC'd.