Very simple... search LS conversion for a '69 Camaro.
-The LS1 motor mount conversion brackets are going to bolt on to the subframe, just like SBC or Pontiac V8 motor mount stands bolt on. '73-74 X-body subframes are very similar to the '69 F-body subframes. The main difference being small details at the front of each front frame horn. '73 & 74 X-body's used energy absorbing front bumpers. Years ago, I pulled a subframe out a 74 Buick Apollo at a local crusher yard & dropped it off at a local friend who was needed a subframe to stick under a '68 Firebird.
-the factory dimensions between the back of the engine & the face of the cowl are going to be the same between a factory installed Pontiac 350 in a '72-74 Ventura & a factory installed 396 in a '68 or 69 Camaro.
-the V8 core support designs between each are very similar, you may be able to use the same aluminum radiator in the V8 Ventura/'74 GTO core support as would be spec'ed as a swap radiator for a '69 Camaro LS1 install. definitely something to measure.
Quick DuckDuckGo search...
http://www.brphotrods.com/products/1...cts/index.html