I looked this up years ago when I did my 67 (back around 1988/89) & the difference in track width was like 1" (1/2" per side) when swapping from drums to disc. This difference was related to the disc brake spindle & hub, so I found drop spindles don't widen the track width any more than stock disc spindles.
16x8 w/5" offset would work fine. I've used my 18x8 w/5.25" offset on my 68 & 74 trucks w/o issue. You will need to trim the lip of the lower control arm slightly for lock-to-lock steering clearance.
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Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive.
It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar.....
Cubic inches is like Indiana Jones with a cheap pistol.
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