mp dizzy help

i am kinda at a stand still right now. iread msd tech page and it states that if you dont have vac. adv then it should fire to the left side which is what my car is doing....but i thought you what it to fire in the middle... so im wrong.. they also say not to use a dial back light but alot of peole say its fine and thats what i use with my ign. which ibcludes a 6al box and moroso wires....so i guess i need to change that first cause the timing mybe off in either way...high/low....but i stii dont get why i can turn the rotor from clockwise to cclockwise about a 1/4" or more....i think im going to try a diff. dizzy i have 2 thats locked out so ill see whats going on with that...where do most you guys get your cap and rotor from and what brand????does msd sell 1 for stock type dizzy????anyway ill keep evrbody posted......all so with my problem the pop/miss at top end does not happen if the cars is not underlaod..in idle i can rev it to 7000 just a sec and no problem but under load it does it..(so could be feul related) gotta check the vol. of the pump and see...thanks for helping