3.91 or 4.11 gears

Looking for a new or good used ring and pinion for a 8 3/4. Tried 4.89's and they are too deep for even the 1/8 in my 66 Valiant. Big problem is I don't have much to spend right now, so I'm looking for a bargain. Also a mini spool, or a set of those "blocks" that replace the spiders. Can someone help a low buck racer? I have some slant six parts I could use for trade.