i am running the hei small cap already
i dont need a btm as i have full control over my ignition timing curve since im using a megasquirt. i also have the bypass wired to a toggle switch so that if for any reason i need to i can lock my timming to 14*btdc witht he flip of a switch
i havent heard many good things about the acell unit myself either
im debating on moving away from the factory style ignition and moving to a crank trigger since my ms unit can trigger off of that.
but for now i think ill just buy a real delco module and see what happens, the one thats currently in the car is a factory original so its over 20 years old and it was prolly time for it to die