Hi MA,
I think you miss the point of the answer I gave.
It’s a 1970 340 engine...
The T/A head in the hands of Bob Mullen and others has been phenomenal!

There are many variants of heads and blocks, but there is only one year of 340 greatness 1970!

Me, I would just get a 408ci 360 short motor and put a pair of Trickflows on... whistling

Or just go mad a get some Brodix heads, that will wake it up too...

Limey

Carpe diem, quam minimum credula postero, thanx Horace!

There’s no point trying to fix stuff that ain’t broke,,, 'but if ain’t broke',,, you is not trying hard enough...