Sept. 1968 is the pad date stamped on Your block. What casting date is the block? I ordered My car in September and it was assembled on 3rd week of December. 4 Months from order to delivery. My speeds and times are the same as Yours with 373 and M21 with Hurst and H-70-15 tires. I jetted the 780 and dialed in the distributor on a Sun machine. It was quick on the street. I also pulled the AIR and installed a 2 1/2 inch exhaust. Good memories. NICK L72