Some junk in the UK

3K pounds is pretty good.
Do your best in keeping the engine light with aluminum parts. I don’t know what the Buick 215 weighs in at but the MoPar engine has an aluminum front cover and W/P. Mostly the later years, not the early years.

What transmission do you have?
904, rebuilt with Alto red clutch packs, kolene steels and a Transgo stage 2 kit. Converter is undecided as yet, I have 2 but both had not been stored correctly before I acquired them in with the engine and box. I wouldn't trust them not to trash my box.