Once you have the front cover off the engine, examine the tensioner bar on the left side. The left tensioner operates on engine oil pressure to keep the timing chain tight, and a ratchet holds light pressure on the tensioner bar when the engine is turned off.
You should be able to press the piston in by releasing the ratchet, then use a small piece of wire to hold the tensioner in place.
Once the tensioner has been secured, just remove the bolts on the tensioners.
I just noticed that you indicated that it's an SC1, meaning that there is only one camshaft but the instructions should be much the same
chain
You should always replace the timing chain, tensioners and sprockets whenever you rebuild the engine.
Since you have to ask the best answer I can give you is take it to a mechanic.
TIMING CHAIN
The 1995 Land Rover Discovery has a timing chain.
timing chain
A 1995 Toyota Corolla has a timing belt.
On a 1995 passport it has a timing belt
A timing CHAIN
timing CHAIN
chain
The Chev 350 and the 6 cylinder do not use a timing belt; they use a timing chain. You need to pull the front engine cover to get to the timing chain. That means pull the harmonic balancer, water pump and anything else on the front. However... they do use a serpentine belt to drive the alternator, water pump, power steering etc. To loosen the serp belt, you should be able to just loosen the tensioner.