1979 Chevy Camaro Camaro engine swap

Is it a 79 or 89 Camero? Your post subject says 79 and you posted 89. And What do you mean by "drilling to the engine"?

The motor mounts are exactly the same. If you retain the fuel injection you will have to also consider this. Fuel injection is computer controlled. The computer must come with the caprices' engine - then you have to wire the engine - you will have to add oxygen sensors and catalytic converters to the exhaust and a few other emission parts that the 79 camaro wasn't intended to have. The work involved installing the stock fuel injection is not worth it. The cost I honestly don't know, but I do know if it was me, It would be too much. Here is what I would do. I would put the caprice block in the car. Then I would put on a set of Vortec aluminium heads - a Vortec raised intake - with a Holley 4 barrel carburator. Put a MSD ignition system in and you will be cookin.
The reason for the Vortec heads is because they are cheap hosepower. Try to stay away from as much pollution control devices as possible -like- EGR valves, O2 sensors, air pumps and catalytic converters stuff like that.
Work yourself up a budget and look at what you can afford. To be honest the sky is the limit, but if you want, give me your budget and I will suggest some things. In your budget put some dollars in for labor that may have to be done outside your capacity.

Another option that is cheap, and more reliable, is to buy the caprice engine with the computer and wiring harness intact.

You won't have to wire anything other than O2 sensors.
And as for the emissions related devices, because your car is 30 years old (depending on what state you're in), you don't have to EPA certify your car every year.

Don't worry about cats, egr, air-pumps, etc.

Thats kinda what I meant in the beginning of my reply. If you do keep the caprices' engine stock, it is not that simple. You will also have to reprogram the computer to 'shut off' all of the sensors associated with the emmissions and the transmission - unless you install them.
The stock computer of the 91 caprice has several emmission, as well as other inputs that (if not reprogrammed and removed) will cause your engine to run rough - and maybe not even at all. The computer adjusts the fuel injection, as well as the timing advance and shift points to the transmission, to give the best fuel efficancy possible. IMO - a 79 Camaros' engine was not intended be 'squeezed' by computers.