I need engine help

xsamis

Hey guys, i need suggestions, last night i was on the highway and my car was making some weird noises so i pulled off to the side got off the fwy and it turned off on me, then i turned the car back on and it really struggled, took a few button press' to turn it on, then i finnaly got it on and i hear knocking, when i drove it home i couldnt really hear it knock in 6th going 65 mph on the hwy, my oil temp was about 240 so a little higher then usual, when i got home, no coolant in the car, some in the tubes but not the reservoir tank, added some, and today i woke up and still hear it knock, although its different because when i hit the gas, its syncing with how much gas i hit, basicly i have rod knock im pretty sure, if not then my clutch or flywheel is toast for some reason, but long story short

Ive got this car from copar smacked up and worked hard for 6 months to get it looking right and running, im good at the basic stuff and even know how to replace a clutch if i need to, should i
1- buy a used motor

2- rebuild the one i have with stronger internals

3- buy a built motor online and if so witch vendor/what motor would you go with

3- LS swap
The reason why 2 and 3 is an option is because i want to be FI in the future
If 2 is in your.opiniom the best choice can you link me a thread that you.think is most useful in building one/putting one together, the fact of compression ratios and all that stuff freaks me out because i dont want to do somthing wrong