Are your spockets marked?
If so, it's fairly clear what to do; You first be certain the sprockets are aligned flush--by placing a steel straightedge across the face of the sprockets and shimming if necessary; next you put the chain on the spockets, properly lubricated, being absolutely certain the chain is not backwards; then align the marks on the sprockets and be sure the punch marks on the front engine plat are aligned so you see the dot punch thru the hole in the cam sprocket, and both punches on the engine plate are aligned at about eleven o'clock. Eyeballing correct alignment of marks requires a good metal straight edge and good lighting.
If you don't have the sprockets marked, you have to adjust the valve clearance of the number 8 and 7 pushrods when pushrods 1 and 2, respectively, are at their highest level, each to .040, then turn the cam until valves 7 and 8 are in balance, meaning one is just opening as one is just closing, with rocker clearance exactly equal, then rotate the crank to TDC and slip the chain onto the crank sprocket and onto the cam sprocket and very carefully reapproach the camshaft, avoiding turning it; if it won't align with the bolt holes, you have to rotate the cam sprocket 90 degrees at a time to keep the bolt holes correct--and that will move the sprocket 1/2 tooth; flipping it will adjust 1/4 tooth, and then 3/4 if you rotate 90 degrees reversed (I can't imagine you'll need to do that since you likely know the correct front face).
It's very tedious to fit the bolts back into the cam with the sprocket fitted. I can't explain why, but it took me 45 minutes just to be sure I wasn't stripping the bolts; they kept wanting to go in at some crazy angle.
When done, readjust the valve clearances to .010.
To test your work, your distributor rotor should point at pushrod tube number 1 when you are at TDC AT THE COMPRESSION STROKE, and at that point the timing marks will be aligned, if you have them.
Don't forget. Never do any of this until you've first properly torqued all of the bolts that are inside the timing cover and under the timing sprocket. Recalling a loose bolt in there can propel you back into the garage where others could discover you in a robotic state removing the radiator hoses, the radiator, the front engine brace, the steering rack, front engine pulley and dog bolt, the timing cover, and finally the chain and sprocket, and starting all over again.
Well, I hope that's accurate, and I hope that was your question. I just realized it may not have been. At least I will have created something I can read to myself from time to time.