I bought a 340 from this company website said $400 to upgrade from 360 to 340 block then quoted $600 & increased to $900 on the final invoice build was 340 E/Q heads Comp roller cam,roller lifters & 1.5 roller rockers ,eagle ibeams .
once i received i removed the masking tape & fitted a vacuum 650 Holley upon start up motor had a loud clatter shut down after 30 seconds & like you removed the heads
He have fitted KB243 pistons with E/Q heads & a .039" head gasket 3 pistons hit the head the other 5 were full of swarf & destroyed the pistons.Once i stripped the engine i found 4 of the spiral locks were hanging out.
Also machining swarf trapped in the main bearing shells.
John apologized & sent new pistons & rings which i sold as it had to be bored as machinist commented it looked like they had honed it with a drum sander
The machinist had to redo the complete motor yes they use the good parts but wouldn't have a clue about build quality.This was all on a engine that come with dyno results
but no engine number to prove it was for the motor tested.
all i used on the new build was the block, camshaft ,lifters & heads
i see the business is for sale but what does he offer he is working from his carport.
It took around 6 emails to get him to send a build sheet avoids all support paperwork for his builds ask you to call
Its strange how he loses so many emails
I guess the fact that his eba site is mostly written in red says it all.
Beware