Your intake has an operating range of idle to 5500 rpm (stock). You need to select a cam that will operate successfully in that RPM range if you want it to run right. If you stuff a real big cam in there it will run like shit!
Go to the COMP sight and look at the FE cams, they clearly show the RPM range. ww
1965 Galaxie 500XL 445ci Stroker C-6
1965 Galaxie 500XL 390ci P-Code, 4-Speed
2001 Ford F-150 SuperCrew 5.4L
2006 John Deer X320 Garden Tractor