Chrisp: The only thing that comes to mind that won't cost you hardly anything, is go buy yourself a nylon washer set or pickup some small nylon washers. Stack them on a 10/32 bolt. (I'm not sure of bolt that holes bushings)Put the bolt in a drill and use a sand cloth or small file and make a set that gets where you want to be. Install them in the distributor. This should get you close to what you want. Now here is a little trick I learned to have the advance move at idle or lets says 1000 rpm. Remove the springs so the advance moves out without revving the engine.
The couple of sets that I made were to get my timing set to 34 degs. I set initial at 17 degs and the bushing gave me another 17 degs. You maybe able to find some small washers that will assist you in sizing. Either way your gonna have to get inventive.
BUSHING SIZE APPROXIMATE
CRANKSHAFT
DEGREES
Red-Smallest 28
Silver 25
Green 23
Blue 21
Purple 19
Black-Largest 18
Also, here is the info from MSD website telling you approx how much timing these bushing give you. You could measure the smallest to largest , record the sizes and that will give you an idea of measurements for that particular timing. Seeing that your after a larger bushing you should be able to make one that will get you in the ball park. Hope this makes sense.
https://www.amazon.ca/Boeray-330pcs-...99316686&psc=1
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68 Firebird. IA2 block, 505 cu in, E-head, Solid roller 3650 weight. Reid TH400 4:11 gear. 29" slick.
Best so far 10.12@133 mph. 1.43 60 ft.
76 Trans am, TKX .81 o/d, 3.73 Moser rearend,
468 with KRE D-ports, Doug headers, 3" Exh.
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