Not sure what you mean by strap at rear of forend.
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It is the flat tie strap & rivet that goes across the back of the bottom wood where it meets the wrist which is what I think Ridolpho is referring to.
Also the chunky "S" in side the box under the wrist looks like it denotes a Savage Butt not a "Small" one if I am correct.
Very nice specimen but the sling is mounted incorrectly. Hooks should be facing outside to avoid scratching the stock.
I wouldn't doubt a bolt head would be changed out to tighten up head space but many rifles left the armory with No.3 bolt heads. I couldn't venture a guess as to the number, but in this case, a Savage marked No.3 bolt head being found that indexed correctly AND head spaced correctly? A No.3 bolt head is difficult enough to find to begin with...what are the odds of finding a Savage marked one that was right on the first go?
AS to the rear strap on the forend....I have seen this type of fitment before. I don't know if it is something done from new or a "re shape" of some kind to fit a new pin. It also appears to be sanded along with the contour of the wood.
I had a 1955 Faz No 4 Mk 2 in mummy wrap some years back. I unwrapped it (kicks self). It had a No 3 bolt head.
With permission from Hesalite, here is my example of the nicest Savage I have seen. It is essentially un issued and shows no sign of having seen anything but storage wear. I've owned this rifle for 12 to 14 years? Note the No.3 bolt head.
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After looking at the close up of the bolt head, I noticed the bolt head guide appeared to be chamfered on both edges. I cleaned the grease out and attempted a better shot...
Attachment 78231
Probably to assist in guiding it into the rail as it travels during cycling past the cut out area where you engage the bolt head.