what kind of hp difference between heads?

$1400? WOW

I apologize but that price is out of hand.

Summit has the 1.92 heads for $320 Shipped bare,
Hughes 1110 springs $150
Keepers off a 2.2L (junkyard) $20
Valves, I used the stock valves. Maybe $250 for some Manley.

$320
$150
$20
$250
$60 to install it all or do it yourself.

Total $800

Little over half of that for a set. Bingo. Just got some for my magnum, I like em alot.