MSD Ignition with TBI

I put a GM TBI kit on the Heep (AMC 360) but I'm having some timing issues. I can tweak the initial timing to where she runs great at bottom or top end but not both! I'm running an MSD ignition with an old distributor and I could fork out the dough for a new MSD distributor or re chip the puter (free) and run a GM distributor (about the same $$ as the MSD) Any input??
 
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