screw the base timing , he wants it to run GOOD !!!!
Turn the dail on the advance light ( hoping you got that kind of gun )
to 14' degrees , then while she's running line the flashing light up with the timing marks by turning the distributor till the light lines up with the mark !!
old 5.0's run the best at 14' degrees advance !!! oh and use premium fuel afterwards
2011 GT Auto