You should be ok, if you kneel down with a torch and look at the front of the gearbox crossmember U section you should see the telltales on it, if you can't it could well be worth getting it up on a hoist. They sound far worse than they are.
If you can't get under try driving 2 wheels of one side up on a steep kerb it gives a lot more room to get under/see.
Ironically in 14 years of Morgan's I never grounded either of my Plus8's but the 4/4 Sport had some big bangs but only ever to the U section.
Good luck.
