block decking compression question

["Dan Curtis" <d.curtis@xxxxxxx>]

Many years ago I purchased a NOS AMC factory replacement block from a fellow
who had set it up for racing by decking the block to .007, drilling out and
tapping the head bolt holes for the larger 1/2 head bolts, removed the stock
pistons (which I still have), installed forged TRW flattops and balanced the
whole setup at the machine shop. When I got the motor from him, all of the
assembly lube and oil sprayed on the engine had turned to a consistency of
thick glue so I had it disassembled and hot tanked and then put everything
in dry storage in separate wrapped packages.

I have been giving some thought to using this motor with the original stock
pistons in my very nice and newly acquired 51K original 68 AMX but would
like to know if any of you technically savvy or mechanical engineering guys
can figure out what the resulting compression ratio would be with the .007
decked block when using the stock bore cast pistons that were previously
10.2 on a block that was not decked.  Also, can anyone tell me how much was
shaved off on a block that has been decked to .007?

I was also wondering if there is a thicker head gasket that I can use to
make up for the block having been decked to get me back to close to the
stock compression ratio.  As an alternative, would using  later model 58CC
heads achieve the same result and get back close to 10.2?  With 91 octane
out here in Phoenix, even a 10.2 compression ratio is pushing it so anything
over that would be tough to run on our "clean burning" oxygenated gasoline.

By the way, I also have that balanced and blueprinted 69 390 that is bored
.030 over for forged 70 dish style piston and decked to about .008 which the
engine builder claims will have a 9.6-9.8 compression ratio.  I would rather
have the stock setup to restore my car to as close to stock as I can.

Any help that anyone can offer in figuring out the compression ratio on
these engines would be greatly appreciated.  As always, I request that you
copy your responses on the list to my personal email at d.curtis@xxxxxxxx
....thanks

Best Regards,
Dan Curtis
Cell 602 317 2018
d.curtis@xxxxxxx