Flex Plate Question

I've been planning on using a factory 764 torque converter with the 727 on my 400/470. Some years back I bought a new MP SFI rated flex plate which I had not used yet so I thought I would use it finally with this engine/trans. I hadn't noticed till yesterday that the flex plate has 7/16" bolt holes and the lugs on the torque converter are 5/16". I would rather use another flex plate than invest in another torque converter so my question is, would a factory flex plate (the original from the 400 which I have) be o.k. to use with this engine/trans. combo or is the motor going to have too much power for a factory flex plate? If I shouldn't use a factory plate, does anyone make a flex plate for higher horsepower applications that has 5/16" bolt holes? The car will be street driven only as I have no plans to take the car racing at the track.

IMO, the factory flexplate will be just fine. The B&M #10230 has multiple bolt holes for both bolt circles and the large and small bolts.

Mopar made three different 6 bolts for the crankshafts stock production flex plates, 12.0 inch with the 5/16 bolt and a 11.0 with the same bolts as well as a 11.0 with the lager 7/16 bolts for the Hi Po motors like the 426 M.W and 440 magnums with the smaller 11.0 inch Hi Po converters.
A lot of the early, pre1969 I think, Hi Po 375 HP 440 motors came with the 12.0 inch converters with the smaller 5/16 converter bolts also

Well, I was going to go with the factory flex plate but it turns out the bolt pattern doesn't match the converter. The bolt holes are 11" apart on the plate and 10" on the converter so I guess I will have to buy another flex plate afterall.

Has anyone had any experience with PRW flexplates?

https://www.summitracing.com/parts/pqx-1831800

https://www.summitracing.com/parts/pqx-1844010

I have a PRW on my 511" RB. It's an 8 bolt crank. The flex plate has holes for about any converter out there. It's been on there since 2021. No issues with it.

The 1831800 looks like it might be a B & M copy.

that was my thought as well.

you have a PM from me on this

Which PRW plate do you have?

P/N 1841310 Platinum series. It's SFI spec 29.1 rated for 3 years.

Thanks.