Those B14-7s are the real-deal old-school drilled core big-nozzle boost-kikkers.
Good luck to whoever bids on em. They are already too high $$$.

I like using either a 1/2A6-0 or an A8-0 booster to a B14-7.
Slow liftoff then super-streak upper stage.

__________________
When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !