It's time for my 1st tuneup on my 272c.i.,I forgot how much fun it was to do a hot valve adjustment!(LOL). A little info on the motor----Blue Thunder aluminum 4-barrel manifold,Road Demon 525cfm. carb,Crane cam(S-264-C),Reds headers,MSD distributor &StreetFire plug wires.Questions are what spark plugs/heat range should I use? And what about timing (standard is 3 BTDC, no more than 6 BTDC) should I bump it a little or stay in the 3-6 range as suggested for stock setting? Oh,it's backed by a 4-speed if that makes a difference. Thanks for any help on this,haven't played with a Y-block since the late 60's.  SKIP