So Many Rabbit Holes...

I'm in the exact same boat. '67 Barracuda, 400 4spd. I've been looking into exactly the same thing. Best deal I found is Cass at DrDiff. Front disc brakes with everything you need is about $800. $295 for new BBP rear axles with green bearings, add $60 - $120 for Precision or Timken bearing (respectively), plus $350 for new larger rear drums to work with the new axles. Totals about $1500 and then need to get new wheels and tires. He offers a new front suspension rebuild kit for a little over $300.

That being said,... he seems to be the most reasonable for the whole package and Cass gets great reviews. I have gotten a lot of stuff from him.

Any time we shop the internet for parts it can stack up really fast.
Patience, Craigslist, investigation and the pick a part yards can save tons of money.
Plus it helps a LOT if a person doesn't have to hire someone to do everything.
YY1 hit the nail on the head about upgrading without killing the bank account.

Examples would be getting brand new large BP drums on a rear end someone was giving away to get it out of their yard.
Or an Edelbrock aluminum intake out of the pick a part for 60 bucks (with the perfectly good Eddie carb on it) for 100 total.
Or a guaranteed good 42RH overdrive trans for 125 (with the converter and large yoke)
Or a nice condition used Hurst shifter in the original box for 60.