8.65:1 compression pistons with 119cc heads should look like this;

Found info on the flat tops with 2 valve reliefs:
Piston Top: Flat-Top 2-Valve Reliefs, Chamfered
Pressed Pin
Comp Ratio: 8.72:1 w/100.9cc Heads, 7.73:1 w/119cc Heads

14097044 gen 6 forged crank.do you see numbers looking up under pistons?

Yup.
Part#14096983 - 1-PIECE FORGED STEEL 454 CRANKSHAFT- 1053 STEEL
DESCRIPTION
This forged steel crankshaft (forging ID #14097044) is made from 1053 steel. It is a Gen. V & Gen VI 454 (7.4-liter) big-block design with the one-piece rear main seal. It is externally balanced.

Flat tops for a 454, from JE, are for forced induction applications. Usually the low 8:1 range with a typical bbc head

14097044 sorry

No numbers under pistons but there is a logo I don't recognize.

Ok well since I am going to need more compression which pistons are the better choice? The four critical points of interest are,

# 1 Compression ratio of 9.5-9.7 cr (unless otherwise recommended)
# 2 Weight to match the dimple rods and 14097044 crank balance
# 3 Non floating pressed wrist pins (for the forged dimple rods)
# 4 Must be forged

I do't really want to spend top $ for these pistons but dont want the cheapest junk either.

Bore size is .030 over (4.280")
Gasket crush size .039
As far as the space between the top ring and deck will depend on piston choice I am assuming.

Engine specs as of my current configuration
ZZ502 hyraulic roller camshaft (will be using the original lifters and pushrods)
Dual plane factory GM brass insert high rise manifold
Edelbrock 750cfm marine carb
Comp cams 1.7 pn 1620-16 rockers
Stellings aluminum exhaust manifolds with thru hull dry pipes
RHS (Pro-Topline) cast iron rectangular port 118cc (might be 119) chambers, 2.19" intakes and 320cc intake runners
Gen 6 4 bolt 7.4 block
Factory forged dimple rods w/ 7/16 rod bolts (is an upgrade to new arp bolts needed?)

Do you have any pics of the heads? I sent you a private message the other day, with my email info. You can email me pics and I could post them here.

600HP with a 731??? Subscribed

Edit, didn't read the 525sc setup. Easily doable!