Clutch & pressure Plate for 64 Dart

well my 64 273 cuda , got a 318 4bbl installed with a 10 clutch / pressure plate . now i'm installing a hot 340 6pk , i'm thinking that 10 pp will not handle that rpm of the 340 . so i'm thinking 10 1/2 clutch setup and new flywheel and scatter bell to fit the tunnel of my cuda . but i've got new tti step chassi headers , is there going to be clearance issues ?
https://www.forabodiesonly.com/mopar/threads/10-1-2-bellhousing.525540/