What I was wondering is if I switched to some aftermarkeet heads like the edlebrock performers will my SLP headers work with them?

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91 Camaro Z/28 5.7
SLP catback
SLP runners
SLP 1 5/8" headers
TPIS airfoil
Thermomaster chip/160 degree thermostat
gutted airboxes/K&N filters

They should, as long as the exhaust ports match up.

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92 Camaro RS, LO3, 5-spd, T-tops

Performance:
K&N Open Air Filter, Edelbrock performer TBI intake, Fastchip Prom, Timing +4 degrees, Centerforce clutch, Xact 8mm wires, SLP 1 3/4" Headers (coated), Flowmaster Catback Exhaust, Z28 Grille w/aftmkt fog lamps, MacEwen white-face guages
Electronics:
Alpine 8030 Alarm System, Valentine One Radar Detector (How did I ever drive without one?), Pioneer DEH 7450 Head Unit w/6-pack CD changer, Pioneer DEQ 7600 Sound Processor, 2 Kenwood KAC-846 Amps powering 2 12" Pro Red subs, 2 Pioneer 6x9 and 2 MTX 4x6 speakers.
NEXT UP: TBI mods, 3.42 gears w/Torsen posi

Well it depends on what head. Your biggest concern will be spark plug clearance to the headers.

How about the edlebrock performer centerbolt heads?

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91 Camaro Z/28 5.7
SLP catback
SLP runners
SLP 1 5/8" headers
TPIS airfoil
Thermomaster chip/160 degree thermostat
gutted airboxes/K&N filters

I agree on the post addressing spark plug clearance. Heads also come with angled or straight spark plug holes. Stock heads (at least mine) have straight spark plug holes. I think that spark plugs themselves can be ordered in different sizes.

As for the Edelbrock heads, I think NJ Speeder can answer your question, since he has them

I am using the SLP 1 3/4 headers with some GM performance parts fast burn aluminum heads and they work pretty good. The fast burns have a raised D-port exhaust and the SLPs will work when you open the hole up on the flange a little.

The angle plug heads give much better spark plug clearance than a straight plug head.
I can do all of the plugs really easily with the headers on except the number 5 cylinder. Its a little tougher. All others are cake.

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L98, 3.27 9-bolt, Hooker shorty headers, custom 2.5inch Y-pipe, no cat, 3inch 2chamber flowmaster, JET AFPR, Ported MAF, Best ET: 13.86 @100mph. 1.99 60'
17 inch ROH "ZS" wheels. 17x8.5(front) and 17x9.5 (rear). Firestone Firehawk SZ50s. 245/45/zr17s and 275/40/zr17s. T56

On the way... Radar Blue 89 Formula, T56, Ram Jet 430, Ram Air, 17inch ROHs.

I agree. I have the Edelbrock perfomer heads and SLP 1-5/8 and have no problem. Angle plugs are a plus.