1979 TA hi performance motor

[Baron Von Zeppelin]

Majority of the 4.4.4. cars were basically full option loaded cars in the 10k range with 2 page window stickers.
However, in that respect - the CB and the Pwr Ant. are the 2 things you usually do not see on most of them. Unless they were Silver Tenth Anniversary Editions (TA/TA)

Have only seen 1 Blk/Blk/Blue Birds ... just in internet pictures ... and was maybe even this same car you have now. It was also low miles being offered by a classic car dealer a few years back.

You can buy what we call a "garden variety" 400 core engine pretty cheap usually. $200-500
1972-up Lemans/Grandprix/GTO/Bird base engine
That is what i would do.
And then buy the forged component stroker kit to have around 455cid and approx 450-500hp. 9.2 - 9.7 Comp Ratio

That platform would have less initial investment than the cost of a pair of aluminum heads by themselves.

Then a pair of repo Over-Size RamAir high flow cast iron exhaust manifolds (aka 70 T/A Ram3 units - with Larger than factory outlets) , and a full performance bolt-on exhaust system from PYPES made for those manifolds , with a transverse mounted muffler.
Clean easy install D-I-Y.

Have the heads and intake and exh mans - gasket matched.
Mild clean up and bowl blend on the heads.

Cliff on the carb
Cliff on distributor recalibration
Cliff on the heads and valve/seat cut specs
Cliff on the cam selection
Basically Cliff on everything as far as build parts and recommendations , maybe even assembly.

His build platforms have mostly all already been dyno proven on the HP targets. No guess work. And no confusion with 27 different cam suggestions from interwebbers.