HVH Super Sucker On 360 Magnum

I also have Long tube Hedman Hedders 1 5/8 primary tube diameter and I have dual exhaust of 2 1/4 inch pipe with An H pipe installed before the mufflers. Mufflers are just glass packs but they don't neck down inside like most glass packs they have a 3 inch inside diameter. So I think I am good in the exhaust department. for ignition I have a crane cams hi-6 cd ignition with a crane cams lx91 coil. Plug wires are taylor thundervolt 8.2mm wires. Distributer is a mopar unit I bouht from don at fbo systems and my initial timing is 16 degrees with a total of 34 all in by 2800-3000 rpm roughly. I have have the timing all in a little late because this engine is in a 4x4 truck with a 4 inch suspension lift and 33 inch tires and 3.55 gears with an A-518 tranny. I plan to have some 4.56 gears installed and when I do I will send the distributer back to don and have him set it to where my timing is all inn a little soon. But he told me since I have big tires and tall gears having it come in around 2800 to 3000 rpm would be best. I just don't know how well tapered 4 hole spacers do on carbed 360 magnums because I have never tried one and that's why I'm asking If I should try one or not. Was hoping someone here has tried them on carbed 360 magnums.