hey guys. new to 4.6

hey guys i have a 1990 ford 5.0 mustang and now i just bought a 2001 mustang gt but here is the thing it has a rod knock so i cant decide if i want to

rebuild the engine with everything i have

get a cobra enigine for it

get a regular gt motor and build up off like head cam and intake

what kinda good head are out there and also what are good cams that you guys use for the 4.6