Since you want stock sounding, good vac.. you should
look at cam for a tow truck.. something with a wide
LSA for the vac.. low duration.. mid 220s... you will
hear more noise from the roller lifters than anything else
and with the alum heads and the compression you should be
able to run pump junk easily... your gonna have to do a
bit of work on the advance curve with all the low rpm..
dont get carried away with the port work.. you want the
velocity... EFI would work great on that