Engine Harmonic Balancer And Distrubutor Tuning

I am wanting (and needing) to tune my distributor to Boss 302 specs, however, there are a few things I need to help with finding.

I'm looking for a aftermarket harmonic balancer that is the same diameter and thickness as the stock unit, as well as an adjustable vacuum advance diaphragm.

Ford balancers say they wont fit early style timing covers, and also require spacers for alignment.

And the only adjustable vacuum advance I saw on summit is this Crane unit, http://www.summitracing.com/parts/crn-99607-1/overview/make/ford, but it says it's for 73 and up distributors with electronic ignition without computer. Anyone know if this will work? From what I have been reading, most of the distributor internals have been the same across many many years.

I'm also looking for a set of distributor springs, I think mine may be shot, there is a ton of advance that comes in really fast even with the vacuum adv. plugged. I found 1 pair, I was looking for a variety pack.. Anyone know where to find them?

When I searched for spring and vac. advance kits for a Ford 302 on summit, there was only 1 spring kit that showed up and it only came with 2 springs. And there was 3 or 4 vac advance that showed up and only 1 was listed as adjustable... Crane doesnt even list the kit I linked on their website, unless you manually type in the part number.

As far as stock vs aftermarket balancers, some of the aftermarket one cost less than a stock one. I'm leaning towards a stock one right now just to make it simpler.

Ill just have to send Crane an email and see. The arm on theirs looks exactly like the arm on mine right now.

That's the one I linked to, which says 73 - 85 electronic ignition. I sent Crane an email asking if it will work with a 69 distributor. It looks identical to what I have. Hope it will work.

I did not know the stock diaphragm was adjustable. And that is the best price I've seen for a stock balancer.

Im deployed right now so I will have to take a look at what I have when I get home. I was hoping to order everything so it's ready when I get home. Guess I'll have to wait.