magnum block/ LA questions

To start out like to say hi to everyone. Been in many diesel forums but new to the Mopar forums. Been in mopars my whole life. I scattered my 360. I have a magum 360 in the shop. I'm considering carb converting it. I want to run a manual fuel pump. Can I install a 360 LA can under the roller lifters? Or no cause the 360 can is flat tappet? I would like to hear your suggestions of what I should do there. I already have the timing cover ect. That I need on that part. On the other hand I'm pulling the heads to check for cracks. If one or both is cracked. Can I install the factory LA heads. I know they oil differently. But if I run the magnum pushrods I don't see what it would hurt. But I'm not sure and have never done this or been around what I'm attempting. Please feel free to give me any advice. I'm not building a race motor or high perf. Just an everyday average engine. Thanks a lot for your help