Take a look at HS283 for information on the main residence and CGT.
You will almost certainly have a CGT liability. The cost for CGT purposes of the 1967 house will be the sum of 50% of the 31 March 1982 value (I assume it was in joint names with your late husband) and 50% of the value in 2001 when you inherited your late husband's share.
The gain for that part of the ownership period between 31 March 1982 and when you moved out in 2003 will be exempt from CGT due to your occupation of it the house. You will also be given exemption from CGT for that part of the gain covered by the last 18 months of ownership. As the house was your main home and it has been let, you will be entitled to a further deduction called letting relief of up to £40,000. See Example 9 in HS283.
If after all those deductions, there is any gain left, the first £11,100 of that will be tax free due to the annual CGT exemption. Any balance will be charged to CGT at 18%, 28% or a combination of the two rates depending on the level of your income in the tax year you sell the property. If you put the house into joint names with your current husband before you sell it, it might or might not reduce your overall CGT liability. However, if you do that, you will lose half your entitlement to main residence relief as I'm assuming your husband has never lived in the house you wish to sell and will not, therefore, be entitled to any main residence relief. If, by your "husband", you are referring to your late husband, you cannot transfer any allowances from him I'm afraid.
I hope this helps but let me know if you have any further questions.
CGT started in 1965. It was rebased to 31 March 1982 so that pre-31 March 1982 gains are tax free and taxpayers don't have to go back into ancient history to trace the cost of assets.
The £11,100 allowance is the annual CGT exemption which you only use if you have capital gains. The personal allowance which is used against income is £11,000.