[fastd]

$43k doesn't sound so bad to me for a BDR; keep in mind that it looks like that situation was one where the buyer bought the car cheap, finished it and made a few bucks in the bargain.

Just to throw out some numbers, depending on how it's built with what parts, BDRs go for $25-$50, similar to Factory Fives.
Superformance go for $40-$80, ERAs go for $45-$90, Kirkhams go for $90-$130.

(Don't mean to incite a riot; just my observations; not my intend to offend anyone)