69427 - my friend Wayne built a Buick Straight 8 engine for his 180” fed in 2012, pg with 8-3/4 Mopar rear. He sold it last year, went to Wichita Kansas area. On 30 percent it ran in the 10s. Alan
p.s. I see the D/D painted on the back, not sure about 1968, but in the early 1960s, D Class Dragsters were both Flathead and Inline engines.