Someone in my recent past made a statement that has stuck with me through the years and it goes like this, "If you think hiring a professional is expensive, try hiring an amateur" basically this goes back to those trying to save a few $$. I completely understand cash is king and more of it in the end equals a happier owner/builder. BUT cutting corners often leads to MORE cash outlay than would have originally been required. I've built so many old cars and each and every one of them that I've cut corners on have eventually exposed my treachery.
While I may have saved a few bucks I've had to pay more in either PITA factor of fixing a part that has failed prematurely or car breakdown at the most inconvenient possible time. Most of my past issues can be attributed to either used components or el cheapo big box automotive store units. I've always chuckled at the 'lifetime' warranty that these auto stores offer on starters, alternators, PS pumps, etc.....sure they will replace it but that doesn't relinquish the fact that you are still stuck, broke down somewhere, under a hot or cold car, tying to fix their lifetime part. I digress.
To summarize, after many years of doing this, I only purchase parts of good quality and after much research and confirmation that it IS a good quality part. This approach has provided me with greater confidence and overall satisfaction than I ever imagined.