Timing question

[Bernie]

I put Howell fuel injection on my truck- Mallory Unilite, Edelbrock Performer manifold and awoke the truck from its Winter hibernation last weekend. I had always set the timing by advancing it until the engine just pings under load and then retarding it until it just didn't. My wife bought me a timing light with the advance function and I tried it out on the truck. It seems that at idle I have 600 rpm and 25 degrees of advance. The idle seems a bit fast, but the advance is a lot more than the manual says it should be. Is this ok ?