What flywheel do we need?

[hockeydad4-22]

We made a deal with Trei for his NP435 set up. Question for those of you who might know.

What fly wheel do we need? Drew is running a 4.9l6 from a 95 F150

It was a manual truck but we pulled all that stuff and tossed it into the scrap bin last spring. Obviously this combo was not from the factory so we need to order one up