Building a 340 engine

Please elaborate!

I think 273 nailed this. I myself would opt for ether a solid flat tappet or roller. But it is hard to get a small roller and out perform a good solid lifter cam.

At 370 cubic inches, you’ll need 1.35 HP per cubic inch to make 500 HP. We are getting a little stout here.

The only thing I can suggest s to save up for the best cylinder head you can purchase. A serious full porting of the Edelbrock heads will be in order. You’ll need to work on the RPM-AG a bit as well (IMO) with gasket/port matching it and going as deep as possible. The capability of the intake really comes through with this work and (again, IMO) with 370 cubic inches, it will be a good pay off.

How heavy is the Dodge business coupe?

Thanks for you replay! The original weight is 2,773lbs. I think it will be about the same when I have swap the Engine, transmission,
and rear axle.