just bought a msd 6a ignition with mechanical advance with the option of changing springs/bushing depending on your advance curve. i am trying to keep the car streetable and economic as possible. if i stay with the mechanical could anybody advise me on what springs/bushing to utilize to keep the ignition as described. i know mechanical is more for race, so should i just return it and get the vacuum model?

92 rs
383 ci w/ dart iron eagle 180 cc runners and 64cc chambers heads
comp xtreme cam 274h .490 lift
holley street avenger 670cfm carb

 

Streetable and especially economical=vacuum.Return it and get the vaccum model 8361..I am very happy with mine to go along with my 6AL.