1967 (YENKO) baldwin motion identification question

[berger]

Struck ou on motor and past owners, both long gone or dead, dealer remembered pulling an aluminum block so it can't be orig. should have been cast iron I guess, oh well vins came back clean and registry said we can get a reconstructed title and vin plate for 50$ so we can race her next season at the drags in Epping probably heavy class, any one know of a 66 cast iron block 427 4sale we think we'll build her as a nostalgia drag since it looks like she used to be one , Thanks for everyone's help.