I have a set of carb 500s and would like to do some upgrades. I have a set of 525 efi setups with ( pcm, sensors, coil packs, injector harnesses and upper and lower intakes. My question is if I bought some 525 heads or dart pro 1 heads would it be a pretty simple swap or are the the block different. Sorry if this question has been asked befor.

Blocks are the same. Heads and cams and all electronics are different.

and you can do better than the stock 525 heads, I think they were edlebrocks, but the exhaust mounting holes are in different places so then you have to mess with that.... Since you will have to have the ecm reprogramed, I would decide on who you want to do that and ask if they have a head/cam recipe for you thats proven and he has a base program for.

I have all the sensors and harness off the 525 plus the ECU. I was thinking about the dart pro 1 heads. And as for cam I might as well change why I am in there. Any cam suggestions

My suggestion is to talk to whoever you are going to have program it before you buy stuff....

That is my understanding as well, Whipple, Precision and maybe a couple more

The 525 is a "sealed" race motor... Im willing to bet there are a few more people that can tweak the ecm than we know about......

I was more wondering if it was an easy swap. I didn't know how differnt the block was from 525 from 500 . Since I had all the stuff. So aside from the heads and cam how differnt is the block and internals.