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Okay so I'm new to swaps

First of all I'm trying do get things done the right way and have something reliable and wont break down...I have a b18a1 block and a p8r b20 head. So all I gotta do is put it all together but before i do it is it worth the time to putting together? Will it pull strong or would i have any problem with in the future cause i dont need anything to break down on me if it a good and reliable swap ill do it but if it not i wont so if there any idea out there for a reliable swap let me know Thanks for yall's help