Do you already have in injected setup? - They make a good difference.

I used EL GT Headers on my EL with GT40Ps. I could change plugs with some difficulty. However you can also put iridium plugs (AU Standard ones) in and they'll last a fair old while.

Hardest part about the conversion is stopping the ignition leads from being cooked

Nigel

My lower manifold is drilled ready but need a few $$ more for the rest.

are you self installing or are you getting someone else to do it?