In 1978/9 when I drove my first RHD TCS 75032429P, I found the clutch pedal not easy to get a feel of the bight point, due to being cable operated. I had no issue with the pedals. Getting 5th gear and reverse could be a challenge.
When I drove LHD TCS 73104129R about 3 years ago, I found I had to wear narrow shoes so as not the hit one pedal when using another.
When converting LHD to RHD, I find the throttle pedal is very close to the carpet, and is slightly further towards me than the other two pedals.
As for heeling and toeing, to be honest, I cannot recall ever having to do this, but I cannot see that if I were wearing proper driving shoes/boots, that would be a problem.
I do own a pair of Sparco driving shoes, and for anyone having difficulty with the pedals being too close together, I would recommend getting a pair of racing boots such as Sparco make.