what cam with performer heads?

Check my sig, and the guy that built my motor said i could change the RR to 1.7 with plenty of clearance. The car is a 1990 though with forged notched pistons.Hope this helps.

2040 is an e-cam basically correct?

I don't really have a suggestion on this but what ever cam you pick, check the PTV clearence.No need to aspirate your pistons.

I use the edelbrock performer heads with a b303 and 1.7s rr with no problems
Here is whats done tto my car
stock short block,edelbrock heads 1.90 valves,b-303cam,1.7 rockers,cobra intake,65mm t.b.,C&L 73 mass air meter,24Lb injectors,Paxton fuel presseruse regulator,K&N cone filter,Mac long tubes,prochamber H-pipe,& Mac dumps,pulleys,msd6al,master blaster coil,Ist air adjuster.


Here is a little something to read
http://www.newcovenant.com/speedcrafter/Engine/Cam/default.asp

To calculate the affects of increasing rocker arm ratio, use this formula:
Lift with new ratio = Lift with stock ratio X new ratio / old ratio
For example, if your stock valve lift is 0.4" with 1.5:1 rockers, and you want to install 1.6:1 rockers--
New Lift = 0.4" X 1.6 / 1.5
New Lift = 0.427"


So the b303 is a .480lift/1.6rr
new lift is .480x 1.7/1.6
lift of b303 with 1.7 rr is .510 that is your new lift
So you know you can get a cam that large with no problems.

I ran an E-cam with 1.72 rockers and stock pistons in my 89GT with no problems. That comes out to like .535". The motor was out of a 93 Cobra so it had the 93 pistons which should be the same as your 92. I would still check it but I would think it would be fine.

Im running the same edelbrock heads (1.9/1.6) with the stock shortblock and also a F-303 cam with 1.7 RR's (.544 lift) ... No problems.