really bad knocking/ticking

i decided to build and l28 that had a spun main bearing, tore the engine down and found that the number five main was spun and fused to the crank.

decided to swap an l24 crank in.

built the engine and got it to fire today, the timing was off and had some bad backfire.

set the timing and let it idle, sounded good at idle speed.

when i whent to give it some gas, at around 3rpm it started to knock really bad.

sounded like a rocker.

i took the valve cover off and set the lash.

still dint fix the problem, i did notice that the timing chain was very tight, and was showing shining on the out side of the chain.

when i was turning the cam to adjust lash the cam would have some play on a compression stroke, it would make a taping sound if the crank was jolted.