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I don't know what size tires you have but wheels up to the late 80s fit and 16" tires are easier to get and much less expensive than 16.5s if you have them or split rims.
Since last time I've picked up a decent tire I am 8 lug rim from the junk yard, installed functioning e-brake cables, and converted to DSII.
For the last couple weeks this truck has been my daily driver; 64 miles/day. Been experimenting with timing and gas mileage. 12 BTDC seems to get 11.5 consistently and 10BTDC pulls 12-12.5 regularly. Gunna bump up to 8 if I can next week and see what that does.