Yes, the engine is a flathead 8. It should be the old style with the distributer down in front of the engine rather than the later type with the distributer up top on the front left.
Track: Brand new would have 168 links. As it wears out, you can adjust the front idlers, then remove a couple more links. When the track has had 10 links removed, you have to replace the track. Track and sprockets are replaced as a set.....old track with new sprockets (and vice versa) won't work out. Count the links on the track....if it is down to 158 or less, it will be time for new track soon.
Steering: A bren carrier had two levels of steering. First stage was through a big cam plate which moved the front pair of idlers on each side left and right. This warped the track, causing the vehicle to make a mild turn. Moving the steering wheel further (beyond 90 degrees) caused the appropriate brake to drag or lock, resulting in more steer. On every carrier I ever bought this steering system has been siezed solid, and often the farmer would try and work around that by some inventive method. I have repaired the steering system on some of these vehicles which were buried for 30 years. It is nothing a lot of heat and a lot of sweat won't fix.
New parts are getting far and few between these days. Check out maple leaf up.org forums for more info on these.
I have owned a few of these over the years, and my latest one is in the quonset waiting for the weather to warm up. When they are kitted out, they are like a rolling gunship. The mk1 version has stowage positions for:
-1 Boys anti tank rifle
-2 Bren guns
-a couple Enfields
-A 1" flare gun
-12 cartridges for the flare gun
-A 4" smoke discharger (ross or Enfield action)
-2 smoke grenades for the above
-6 no36M mills bombs
-stowage bins for 4 chests of Bren mags, pouch for 2 Boys mags, and/or lots of small arms ammo.
As well, they can be fitted for the Vickers, the PIAT, various mortars, flamethrower, or to tow light guns. They are a hoot to drive cross country.
This was my last carrier, about a decade back. We drove it out, unannounced, to Shilos battle of the bulge match. Turned some heads, believe me.