The best you can do isn't cheap , and won't be good enough.
Billet cap on the driver's side for sure.
Mark Williams sells them.
If you don't have access to a mill and measuring equipment , you are paying to have it fitted.
Some guys do both caps , but I don't know that it is necessary.
Good gears.
Excel by Richmond are made by the people who brought you Covid 19.
Regular Richmond are made in Italy.
US Gear are made here , but were recently acquired by an investment group , and I am having trouble getting the set I ordered through Strange. ( 4.30's for a 9" Ford )
A back brace is mandatory , and you cannot just fire up sparky and cook it on there.
The housing will warp.
Stitch weld , and take a long , long time.
You should move the leafs inboard if you stick with them , so you are moving the perches.
And I found out the hard way that the stock shock location and a back brace on an early A body will require some creativity.
I am not sure on the E body.
I don't bother with the 8 3/4's any more.
90 % of the racers on the planet seem to like the 9 " , and so do I.