Engine Mounts/Frame Brackets for a 71 C/10

[cars1986@verizon.net]

Hello, I'm new to this forum and I have a question. I know this sounds weird but, the 350 engine in my 71 c10 is worn out, and I was given a 350 Oldsmobile engine that was rebuilt. I would like to install this engine in my truck. I've been told that the crossmember/front end is a pretty close match to a 1973-80 chevy/gmc truck. I have the motor mounts and frame brackets from a 1980 Chevy truck that had a 350 olds diesel engine in it from the factory. these mount bolt right up to the olds 350 gas engine. My question is the frame brackets- will the bolt up to the crossmember/frame of my 71? Anyone have any experience putting 73-80 frame mounts in our trucks? Thank you all for any help you might offer.