I had to look that flex plate number you said in your note up and it's a Pioneer FRA202. Decent OEM style parts but not something I would use if you have any engine mods that will move rpm limits up and above 5000. You probably need an SFI approved flex plate instead. Your engine should have a 28in oz external balance and a 2 piece rear seal if that's a '69 351W assembly and your builder didn't install a neutral balance or, shudder, a 50 in oz late model rotating assembly. What is a PITA is the small bell transmission and the 157 tooth ring gear. This TCI piece, 529618, should work. You get into two different converters as well - you will need the 10.5" bolt circle. I'm kinda disappointed in the TCI converter that's in my '31 so I now have a Hughes to go in. My TCI flex plate is fine though(a note, TCI is now part of Comp Cams, so maybe their quality has improved).
As far as 'communicating' can I suggest standard PM's instead of this Visitor Message format.
I was hoping you can help. I had a 351w built for my 68 mustang. I am pretty sure it is a 1969 motor. The shop dyno'd the motor before I picked it up, which means there was a flexplate on the motor at some point. The motor has been at my friends/mechanics house waiting to be put in. I am having a c4 transmission built for the car. The guy rebuilding the 1974 c4 asked me to buy a flexplate and a torque converter. When I went to check the motor, there was no flexplate. When I went to buy one online there are internally weighted and externally weighted. I was told to ask the shop who built my motor which flexplate I needed. They have been unresponsive. I see on the list of parts I purchased from the motor shop a "FRA202 flexplate." When I search that it seems like that is a flexplate for a c6 tranny. I'm not sure what flexplate/torque converter to get so that they match up with my c4. The c4 has a small bell housing, just like my stock c4 had.