I had my 40,000 mile after stock rebuild LA 360 to 5800 several times with no ill effects.
AFB 4 barrel with mild unknown cam (may have been MP 272) and stock 360 manifolds with 2.5 duals, 3.23 SG. Auto with low buck DIY "shift kit".
I was afraid to go to 6K, so decided to stop at 5.8.
IIRC the best ET was shifting at 5600 in the 1/8 mile. Mid 9 seconds in the 8th.
Your long bed truck weighs what??
My Dakota ext cab weighs 4200.
My 73 Satellite stripper weighs 3700.
