Thanx everyone.
I found out the engine in the kit is a 327. I wanted a 390 so I went to the parts box to find parts that looks like 390 parts. I used the kits 327 block, transmission and air cleaner, chevy small block heads and intake manifold, ford valve covers, mopar exhaust manifolds and front cover and oil filter from a viper engine. I used BMF on the air cleaner lid and hand painted the red and blue. I drilled the block and installed the distributor in front and wired it.
Interior is all from the kit, except I added seatbelts.
The chassis has a Challenger rear section and a road runner front section and I modified the front inner fenders to look somewhat like AMX inner fenders (the kit had pickup style inner fenders) I used the kit's firewall and fabricated the exhaust from various parts I had.
Jo-han kits are not known to be detailed kits, so some work and fabrication is needed to build a nice and detailed model. But Jo-Hans body's are awesome, and this AMX body is no exception.