['ol Pinion head]

As originally produced as '71 455 HO engines, there are
- 3 different 2 letter block codes,
- 3 different block casting codes depending on date cast
- 2 different styles of 197 casting heads, early and late...
- very expensive 455 HO specific Quadrajets that never go with an engine
- an expensive distributor, that came in 5 production dates.
...and there's more

Consideing what factory round port engines go for in nice rebuildable shape, Maxilo, you probably ought to be more specific with what you believe you need.

[1971455HO]

"ol Pinion head is right Maxilo,
Unless you are absolutely dead set on having everything 100% 455HO, I would consider building any complete 455 that is rebuildable. Hang a good set of forged rods and pistons on the crank. If you still want to go with a set of HO heads & intake, you could.Putting an HO engine together a piece at a time is cost prohibitive for most of us. Not having the original (born with) engine knocks the value off about 15%. But, putting in a numbers & date correct HO engine won't put you back in @ the top price either. It's not the original. NO CIGAR!

If it's just a want to thing, It's your money. You can have a neck snapping 400+ HP engine for considerably less than what you will spend on true HO parts.

The last complete used 455HO I saw for sell was more than 5 years ago and the guy wanted $9,000 US dollars for it. It was probably a pieced together engine. The date codes were all over the place on it.

You asked if I will help you find a 1971 455HO engine. I will, if that is what you really want?