[Martyn L. Schorr]

I am certainly not questioning letter from Joel. But all it really means is that car may have been worked on at Motion Performance, like hundreds or even a thousand cars over the years that Motion was in business in Brooklyn and later in Baldwin, LI. If engine had been sent out for work, maybe the machine shop stamped it to ID the block. Not trying to take anything away from the car, just trying to put things in perspective. All the typical Motion add-on parts were available over the counter at Motion and via mail order from catalog and magazine advts.
Would be great if shop invoices for car were found,
Marty