Clutch disc 4-Speed Barracuda 1966

In the shop- and service manual for 66 Plymouth it says, that standard clutch size for 225 engines is 9 1/4". For 8cyl. vehicles with the 273engine it should be 9 1/2". So I do have the 9 1/4"-size clutch and now upgraded the engine to a commando version with more hp.

The Borg and Beck solution sounds good. Wished to know, if a simple change of the old 9 1/4" clutch disc would be "strong enough"...