When I did my truck (haven't done the Valiant yet) I did the tricky and tight spaces first. (rear and front)

Then use the middle section to get everything aligned.


Plus I added flanges to the cat, muffler and rear section so you can take out the exhaust easily.............


Having a small slip fit at the flange (leading section slips into trailing) helps with alignment, and helps prevent blowing out exhaust gaskets.


And finally use stainless steel bolts with double nuts (i.e. jam nut it) makes it easy to take apart as the bolts don't rust out....

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes