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have your chassis tied together?

I'm not saying not to eventually change the headers would not be high on my priority list as conventional larger ones are only going to help on the very top end work through PIPEMAX first

backpressure is the most obvious thing for falling on its face at higher rpm- when the backpressue goes up just pull the mufflers off and try it I use 3" in 3" out Turbo mufflers 3" inside don't get talked into larger headers

usual things work on timing curve 6 cyl torsion bars- give em a try is that through the mufflers? if so not bad check the backpressure on the mufflers and vacuum at High rpm and report is that compression real with the heads cc'd and what's the deck clearance 10:1 is not much for that cam and...

do a compression check before and after each change If you take of the timing cover check your chain and you might see markings on the front of the cam, check the chain see if you have adj rockers and solid lifters- most likely you would have caught this some time did you buy the purple shaft or...

so just don't use any old flywheel you are in the lift range where you need to dbl check your rocker geometry you flat tappet guys can also run amc lifters and oil the adjusters through the pushrods- works good

do any flywheels have balance weights?

Great post OP needs to factor in hard ex seats and new guides if he plans on putting many miles on his build kb's are the way to go with iron heads there is no easy fix

cyllinder head covers? valve spring and rocker arm oil shields? breather holders?

check your new heads for runout, valve stem clearance shine a light in the ports and look around the seats many need to be "blueprinted" out of the box" E just rushes the machine work or you get someone on the line having a bad day

first do not think of 906 heads unless race gas only NOT for street with pump gas use the KB or Icon reverse deflector or custom pistons that fillup the intake side of the chamber 906 spark plug is in lousy location and chamber is really poor- will detonate no mater what compression on pump gas...

426 w compression height is way too tall for 383 There should be shelf quench pistons 4 383 but problem getting proper compression for street CC EVERY HEAD- both ends many are not as advertised and the factor head specs are for minimum cc "blueprinted" NHRA spec heads not factory GET QUENCH...

+3 needed ONLY if you have a lock up converter Type F has Ford spec seal sweller and friction- NOT for long term use will shift harder but not better I recommend the big Transgo Kit and stock fluid X Service Mgr speaking