Might as well get it checked out, clearances on shims etc. Get her cleaned up and surfaces machined. Make sure to check your cam lobes, several of mine had become tapered and wore down the shims which caused a whole lot of hurt when they popped off the top of the buckets.
If you need new valves, shims or buckets use blue top 4a kit, works with the 1g and there is more of a range to choose from when it comes to the shim sizing, also cheaper and easier to find.
Buy a TGP head gasket set, cost me ~250NZD. Has everything you are going to need except head studs.
Stick with the 1G, with only a few mods they can become a really fun engine to drive, just need to get them revving happier.
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