Yes you can drop the header out from below on the left side. Topside on right.
For re-assy you can use Remflex 3003 header gaskets. (Couple pieces of 3/8-16 all-thread cut to 1 1/2" threaded into the heads is helpful for re-assy alignment and keeps you from going 3 arms mode.)
https://www.summitracing.com/tx/part...-_-remflex-inc
Remflex 8032 collector gaskets
https://www.summitracing.com/tx/sear...aillocation=tx
ARP 400-1204 Drilled head (safety wire) header bolts.
https://www.summitracing.com/tx/parts/arp-400-1204
Nickel anti-seize
Let me know if you need the collector hardware info.