That motor has a Roller Cam so if you want to run a Mallory....run Part #3770401 for one with a Unilite.....#5070401 Magnetic Breakerless Mechanical Advance....#5770401 M/B with Vaccuum advance.....These have the longer shaft that 5.0's had, they will engage farther down the
Oil Pump Shaft and can only be run on 5.0 style motors with the
oil pump driveshaft that is hexed farther down....(Usually only a problem with Chro-Moly
Oil pump driveshafts.) any other Mallory would probably need the gear changed, but will physically work.....If you run an MSD Distributor you HAVE to change the gear to a steel unit......Part # 8582 for the distributor and Part # 85833 for the gear....comes with instructions to install....Machine shop can do for about $20, or if you send it to MSD they will do it for free......
Regards,
Brian
www.teamcracing.com
HAPPY HOLIDAYS