The headers on my 454 burned a hole in the plastic line that carries oil from the fitting above the oil filter to the gauge. I bought a 90 degree fitting so I can turn it away from the headers but now it touches the block. I know the headers get much hotter than the block but will the block get hot enough to burn a hole in the line? Thanks!

no the block wont get that hot, but I would cover the line with a loom of some sort to protect the hose from getting a hole from rubbing against something, and also from the high heat around the headers.

rerun the line using copper tubing.

I like the copper tubing as a long term solution but I have one question. With copper do I need a flare at each end or would a fitting with a ferrel (hope I spelled that right) work. Thanks!

neck,
The copper tubing will work with compression fittings, just like the plastic but... copper will end up cracking sooner or later due to engine movement and vibration. Make sure to put a couple of "loops" in it, like brake lines have, to help absorb the movement. A better fix is to get a braided line kit. They really are not all tha expensive in the long term.
By the way, you can run the oil pressure gauge line along the top of the engine and down to the front of the oil galley and get it away from everything, there are several places on a rat that you can hook up an oil pressure gauge.

Another option/solution is to use an electrical gauge.
I use a Stewart Warner electrical oil pressure gauge. I caught my mechanical line just befor it broke inside the car, copper line that had stressed.
I decided that 200+ degree oil shooting out inside the car at 70psi was a little more than I wanted to deal with. also single wires are very easy to run and conceal. and my electrical reads exactly as my mechanical did!


Rocky

I have a mechanical Auto-meter oil pressure gauge in a "gauge-pod" on the windshield A-pillar. I used Auto-meter's pre-assembled braided stainless hose. It has crimped-on ends with 4-AN fittings.
One end screws right to the gauge fitting and at the block end I have a 4-an to 1/8 pipe thread adapter. I got a long enough piece (6 foot) to go down the pillar, across the dash, down the cowl, thru the firewall and a couple of coils for engine movement neatly tie-wrapped on top, and then right to the oil port plumbing, behind the headers.

It fits great with no leaks for the last 2 years and I'm not worried about abrasion or heat.

There's another type of tubing that Auto-meter makes for severe duty. They have pre-assembled lines for mechanical gauges made of kevlar....
I guess they are bullet-proof !